New review comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/pull/29288#discussion_r691642455

Comment:
What do you think about an `environment/build-style/` file that sets `archs` for the supported archs? This way you don't have to detect if these are set before `do_build` in order to trigger `broken` (or maybe it's the best way, since it avoids duplicating the information?).

Overall looks really good, just want to be sure of the best way of signaling when zig is unsupported.